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Liters to Gallons conversion calculator
"Keeping fish for any period of time doesn't make you experienced if you're doing it wrong. What does, is acknowledging those mistakes and learning from them." ~Aeonflame
"your argument is invalid." ~Mommy1

They are fine being the only one of their kind in the tank but I noticed that it was a lot more active and interesting to watch when there was 2 in there. I have a 20 gallon with 2 rams in, 1 male 1 female. They are not mated and chase each other a fair amount but never any harm and there are spots that the female can hide if she doesn't want to get chased. I don't know if you have room for 2 but that's just what I've noticed in my tank.

How big a tank is it? Yes single is fine but they are probably best kept in at least a pair if you want to see their neat behaviors. While they are a social fish, I think the general guideline that I have seen is that the bolivian ram should each have a territory that is about 8-10 inches square of your tanks footprint with lines of sight broken by decorations/plants especially if you have a mating pair. I had 5 in my 58 gallon and they were amazing to watch commune together but when a pair were hooking up they basically took over 3/4 of the tank and pushed the remaining fish to the side glass. If I were to do it again I would only put at most 3 in the 58 Gallon or 2 in a 30 gallon.